The work aims to design and develop a new type of automatic mechanical device used to sort and count coins conveniently and quickly. The mixed coins (1 jiao, 5 jiao and 1 yuan) were transported to inclined ramp by feeding funnel and horizontal conveyor belt, and the coins were quickly sorted through low-frequency vibration and diameter filter. Then, the coins were weighed and counted under the control program developed by C language, single chip microcomputer and pressure sensor; besides, the results were displayed on the LCD screen in real time until the coined were sorted and counted. With light structure and reliable performance, the developed experimental prototype could automatically sort and count the coins quickly and accurately, and the maximum amount of the coins suitable to it was about 260 per minute. The device effectively reduces the technical difficulty and complexity of the coins' sorting and counting. It can be applied in some working organizations and living places which need large coin circulation, and has better application value and promotion prospect.